I do mostly sports photography but this season have started assisting with weddings before taking on some weddings on my own next year. To date I have gotten by with fast glass/modern sensors and basic bounce flash when shooting receptions. By and large I and the studios I shoot with have been pleased with the results of this.
I'm now to the point where I want to get a bit more creative with OCF. I currently own 2 430 EX IIs that I intend to make my OCF units for a 3 light set up. My question is this: the wireless receiver is already built into the 430 EX II, correct? I am aware that these guys can only serve as slave units and so if I were to pick up a pair of 600s, there's no extra transceiver I need to attach to the 430s?
I know this is super basic and thank you in advance for the confirmation.

it does reinforce my intention to note the 430s are limited without radio triggering, while being more exact.

